First upgrade I did to my 76 Puch Maxi was put the Tecno Boss pipe on, But it sounds, I dunno, "poppy"? Not sure if this is the natural sound, or if it's 4 stroking, or if I did something else wrong. Everything is stock with a 12mm bing and a 60 jet I believe (cant really tell, but that's what the wiki told me)..
Low end sucks, I'm hitting 31 on the flats. I bought a 15mm bing, but wanna learn how to jet/tune this one before I pop that one on..